104 lines
3.6 KiB
Plaintext
104 lines
3.6 KiB
Plaintext
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U-Boot for LibreTech AC
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=======================
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LibreTech AC is a single board computer manufactured by Libre Technology
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with the following specifications:
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- Amlogic S805X ARM Cortex-A53 quad-core SoC @ 1.2GHz
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- ARM Mali 450 GPU
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- 512MiB DDR4 SDRAM
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- 10/100 Ethernet
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- HDMI 2.0 4K/60Hz display
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- 40-pin GPIO header
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- 4 x USB 2.0 Host
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- eMMC, SPI NOR Flash
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- Infrared receiver
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Schematics are available on the manufacturer website.
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Currently the U-Boot port supports the following devices:
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- serial
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- eMMC
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- Ethernet
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- USB
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U-Boot compilation
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==================
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> export ARCH=arm
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> export CROSS_COMPILE=aarch64-none-elf-
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> make libretech-ac_defconfig
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> make
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Image creation
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==============
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Amlogic doesn't provide sources for the firmware and for tools needed
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to create the bootloader image, so it is necessary to obtain them from
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the git tree published by the board vendor:
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> wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
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> wget https://releases.linaro.org/archive/13.11/components/toolchain/binaries/gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
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> tar xvfJ gcc-linaro-aarch64-none-elf-4.8-2013.11_linux.tar.xz
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> tar xvfJ gcc-linaro-arm-none-eabi-4.8-2013.11_linux.tar.xz
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> export PATH=$PWD/gcc-linaro-aarch64-none-elf-4.8-2013.11_linux/bin:$PWD/gcc-linaro-arm-none-eabi-4.8-2013.11_linux/bin:$PATH
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> git clone https://github.com/BayLibre/u-boot.git -b libretech-ac amlogic-u-boot
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> cd amlogic-u-boot
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> wget https://raw.githubusercontent.com/BayLibre/u-boot/libretech-cc/fip/blx_fix.sh
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> make libretech_ac_defconfig
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> make
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> export UBOOTDIR=$PWD
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Download the latest Amlogic Buildroot package, and extract it :
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> wget http://openlinux2.amlogic.com:8000/ARM/filesystem/Linux_BSP/buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz
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> tar xfz buildroot_openlinux_kernel_4.9_fbdev_20180418.tar.gz buildroot_openlinux_kernel_4.9_fbdev_20180418/bootloader
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> export BRDIR=$PWD/buildroot_openlinux_kernel_4.9_fbdev_20180418
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Go back to mainline U-Boot source tree then :
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> mkdir fip
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> cp $UBOOTDIR/build/scp_task/bl301.bin fip/
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> cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/bl21.bin fip/
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> cp $UBOOTDIR/build/board/amlogic/libretech_ac/firmware/acs.bin fip/
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> cp $BRDIR/bootloader/uboot-repo/bl2/bin/gxl/bl2.bin fip/
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> cp $BRDIR/bootloader/uboot-repo/bl30/bin/gxl/bl30.bin fip/
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> cp $BRDIR/bootloader/uboot-repo/bl31/bin/gxl/bl31.img fip/
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> cp u-boot.bin fip/bl33.bin
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> sh $UBOOTDIR/blx_fix.sh \
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fip/bl30.bin \
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fip/zero_tmp \
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fip/bl30_zero.bin \
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fip/bl301.bin \
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fip/bl301_zero.bin \
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fip/bl30_new.bin \
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bl30
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> $BRDIR/bootloader/uboot-repo/fip/acs_tool.pyc fip/bl2.bin fip/bl2_acs.bin fip/acs.bin 0
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> sh $UBOOTDIR/blx_fix.sh \
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fip/bl2_acs.bin \
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fip/zero_tmp \
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fip/bl2_zero.bin \
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fip/bl21.bin \
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fip/bl21_zero.bin \
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fip/bl2_new.bin \
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bl2
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> $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl30_new.bin
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> $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl31.img
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> $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl3enc --input fip/bl33.bin
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> $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig
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> $BRDIR/bootloader/uboot-repo/fip/gxl/aml_encrypt_gxl --bootmk \
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--output fip/u-boot.bin \
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--bl2 fip/bl2.n.bin.sig \
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--bl30 fip/bl30_new.bin.enc \
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--bl31 fip/bl31.img.enc \
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--bl33 fip/bl33.bin.enc
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and then write the image to SD with:
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> DEV=/dev/your_sd_device
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> dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
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> dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
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